This is outside my expertise but i remember doing svg animations, web gl animations and unity animations roughly ~10 years ago.
But maybe that was a few years to late or not applicable to your case?
But an app with vector animations should have been doable (not to hard in theory) if you could have found the investment for it, right?
Professional animators are artists. They need professional animation tools, like flash, to work with, not svg/webgl/unity that a programmer would be more comfortable with. They need things like a timeline, character library, animation pallet, built in tweening tools, etc.
(Unity do have animations tools for artists (it is partly made for artists) but not so good for vector graphics and not close to flash, and definitely not back then.)
But an app with vector animations should have been doable (not to hard in theory) if you could have found the investment for it, right?